Flights flown between July 1, 1939 and August 23, 1939 by Midwest Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BXF-1-2 through BXF-3-72. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.

Coverage.Spatial

Peoria County (Ill.) (W 88°59′--W 89°26′/N 40°59′--N 40°31′)

Contributing Institution

Illinois State Geological Survey

Format.Use

340 remote-sensing images, 1.13 gigabytes, average file 3.4 megabytes

Format.Creation

Scanned from 9 x 9 contact prints (nominal scale ca. 1:20,000) on Crosfield 646IE drum scanning system at 750 dpi. Quality assurance target not published but available by contacting the Illinois State Library Map Dept. MrSID files compressed at a target ratio of 12:1. Uncompressed TIFF images on cd available from the Illinois State Library Map Dept.

Relation.Requires

Mode of access: World Wide Web. System requirements: Plug-in or image viewer, ExpressView Browser plug-in available for download. System requirements for interactive map: Internet Explorer best, frames and JavaScript enabled.